#include <REGX52.H>

void Delay(unsigned int xms)		//@12.000MHz
{
	unsigned char i, j;
	while(xms--)
	{
		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
	}
}

void main()
{
	unsigned char LEDNum = 0;
	while(1)
	{
		if(P3_7==0)
		{
			Delay(20);
			while(!P3_7);
			Delay(20);
			
			LEDNum++;   //0000 0000
			P1=~LEDNum;	//1111 1111
		}
	}
}